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The expiration date of a drug is estimated using stability testing under good manufacturing practices as determined by the Food and Drug Administration (FDA). Drug products marketed in the US typically have an expiration date that extends from 12 to 60 months from the time of manufacturer.

Samples are stored at accelerated, long term and at room temperature. The samples are then analyzed at various intervals to determine the rate of decomposition. Shelf life is calculated from this rate.

Shelf-life is the period of time during which a food maintains its acceptable or desirable characteristics under specified storage and handling conditions. These acceptable or desirable characteristics can be related to the safety or quality of the product and can be microbiological, chemical or physical in nature.

Most shelf-stable foods are safe indefinitely. In fact, canned goods will last for years, as long as the can itself is in good condition (no rust, dents, or swelling). Packaged foods (cereal, pasta, cookies) will be safe past the 'best by' date, although they may eventually become stale or develop an off flavor.

expiry date is the date at which a product should be pulled of the shelve of its seller because its harmful if used by the consumer, shelf life is the duration of time that a product can stay useful or salable to the consumer.

The term "shelf life" of a drug slightly differs from a drug's "expiration date." The shelf life generally relates to a drug's quality over a specified period of time, whereas the expiration date relates to both quality and safety of a medication at a specific point in time.

The expiration period of a production batch should be calculated from the date of release of that batch. The date of such a release should, under normal circumstances, not exceed 30 days from the date of production of that batch.

The minimum shelf life indicates how long the product retains its function and structure when stored correctly. However, this is not in regard to a product's expiration date. A product can therefore easily be used without any hazardous effects after this period has come to an end.